In a bipolar junction transistor ........

General Science (CDS) Physics

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In a bipolar junction transistor

all the three regions (the emitter, the base and the collector) have equal concentrations of impurity

the emitter has the least concentration of impurity

the collector has the least concentration of impurity

the base has the least concentration of impurity

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Explanation:

In terms of concentration of impurity (a.k.a impurity doping concentration, often abbreviated to doping concentration), from the highest to the lowest among the three regions of a bipolar junction, emitter, collector, and base are the correct order. The above order is independent of the type of BJT, npn or pnp.